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        <h2 class="post-title" itemprop="name headline">golang_struct_interface嵌套传参和多态

          
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        <h3 id="interface-struct-嵌套"><a href="#interface-struct-嵌套" class="headerlink" title="interface struct 嵌套"></a>interface struct 嵌套</h3><ol>
<li>struct struct //继承(不能多态), 如果内部struct实现了接口, 它也相当于实现了接口</li>
<li>struct interface //可以多态</li>
<li>interface interface  //单纯的导入</li>
<li>interface struct  //不允许</li>
</ol>
<a id="more"></a>

<h3 id="struct定义怎么都行-有interface-参与struct-就有限制"><a href="#struct定义怎么都行-有interface-参与struct-就有限制" class="headerlink" title="struct定义怎么都行, 有interface{}参与struct,就有限制"></a>struct定义怎么都行, 有interface{}参与struct,就有限制</h3><h4 id="struct方法参数是指针还是值-此处是单纯的结构-定义传递什么都行"><a href="#struct方法参数是指针还是值-此处是单纯的结构-定义传递什么都行" class="headerlink" title="struct方法参数是指针还是值 (此处是单纯的结构, 定义传递什么都行)"></a>struct方法参数是指针还是值 (此处是单纯的结构, 定义传递什么都行)</h4><p>无论方法参数定义成指针还是值, 都可以调用</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">type S struct &#123;</span><br><span class="line">	age int</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">func (s S) Value() &#123;</span><br><span class="line">	fmt.Println(s.age)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">func (s *S) Point(age int) &#123;</span><br><span class="line">	s.age = age</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">func main() &#123;</span><br><span class="line">	s := new(S)</span><br><span class="line">	s.Point(1)</span><br><span class="line">	s.Value()</span><br><span class="line">	fmt.Printf(&quot;%T\n&quot;, s)</span><br><span class="line"></span><br><span class="line">	v := S&#123;&#125;</span><br><span class="line">	v.Point(2)</span><br><span class="line">	v.Value()			//此处是重点, 竟然这个也自动转换</span><br><span class="line">	fmt.Printf(&quot;%T\n&quot;, v)</span><br><span class="line"></span><br><span class="line">	p := &amp;v</span><br><span class="line">	p.Point(3)</span><br><span class="line">	p.Value()</span><br><span class="line">	fmt.Printf(&quot;%T\n&quot;, p)</span><br><span class="line">&#125;</span><br><span class="line">//output:</span><br><span class="line">1</span><br><span class="line">*main.S</span><br><span class="line">2</span><br><span class="line">main.S</span><br><span class="line">3</span><br><span class="line">*main.S</span><br></pre></td></tr></table></figure>

<h4 id="interface-实现struct方法参数是指针还是值"><a href="#interface-实现struct方法参数是指针还是值" class="headerlink" title="interface 实现struct方法参数是指针还是值"></a>interface 实现struct方法参数是指针还是值</h4><p>接受者是值的都可以赋值</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">type I interface &#123;</span><br><span class="line">	Get()</span><br><span class="line">&#125;</span><br><span class="line">type S struct &#123;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">func (s S) Get() &#123;</span><br><span class="line">	fmt.Println(&quot;get&quot;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">func main() &#123;</span><br><span class="line">	ss := S&#123;&#125;</span><br><span class="line"></span><br><span class="line">	var i I</span><br><span class="line">	i = ss</span><br><span class="line">	i.Get()</span><br><span class="line"></span><br><span class="line">	i = &amp;ss</span><br><span class="line">	i.Get()</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>接受者是指针的只能指针赋值</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">type I interface &#123;</span><br><span class="line">	Get()</span><br><span class="line">&#125;</span><br><span class="line">type S struct &#123;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">func (s *S) Get() &#123;</span><br><span class="line">	fmt.Println(&quot;get&quot;)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">func main() &#123;</span><br><span class="line">	ss := S&#123;&#125;</span><br><span class="line"></span><br><span class="line">	var i I</span><br><span class="line">	//i = ss , 此处编译不过</span><br><span class="line">	//i.Get()</span><br><span class="line"></span><br><span class="line">	i = &amp;ss</span><br><span class="line">	i.Get()</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="golang多态实现"><a href="#golang多态实现" class="headerlink" title="golang多态实现"></a>golang多态实现</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">type P interface &#123;</span><br><span class="line">	Say()</span><br><span class="line">&#125;</span><br><span class="line">type P1 struct&#123;&#125;</span><br><span class="line">type P2 struct&#123;&#125;</span><br><span class="line"></span><br><span class="line">func (p *P1) Say() &#123; fmt.Println(&quot;say p1&quot;) &#125;</span><br><span class="line">func (p *P2) Say() &#123; fmt.Println(&quot;say p2&quot;) &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">func main() &#123;</span><br><span class="line">	p1 := &amp;P1&#123;&#125;</span><br><span class="line">	p2 := &amp;P2&#123;&#125;</span><br><span class="line">	var p P</span><br><span class="line">	p = p1</span><br><span class="line">	p.Say()</span><br><span class="line">	p = p2</span><br><span class="line">	p.Say()</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
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